Know your NAS address

You may have configured external access through the synology.me dynamic DNS service or some other service. Perhaps your server is only available in the local network. In any case, you'll need to have the IP address or domain where your NAS is reachable.

If you need to change the default daily execution frequency, visit the schedule tab.

Secure your NAS!

You'll have terabytes of valuable assets stored in it, securing them is worth a few extra steps.

Disable SSH

It's best to disable services you aren't using, as they might open security vulnerabilities. Go to the DSM control panel and disable SSH (and any other services you aren't using). Yes, there have been attacks over SSH before that ended up in lots of Synology servers compromised and turned into Bitcoin miners (with Atom processors, go figure).